I started pedaling last winter, and was able to get a great workout in a short amount of time - but wasn't able to go very far. Now that it's summer, I can go a lot further but it takes much longer to get the same workout in. I'm wondering how much of this is due to the extra endurance I have now, and how much is due to the warmer weather. I haven't changed much on my bicycle either, just added a slightly taller seatpost and a better seat and I'd already been able to go further/longer before I made those changes. Should I be able to continue needing to spend more time to get the same amount of exercise in next winter, or will my workouts become more efficient then?